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Cribroperidinium saetigerum
Cribroperidinium? saetigerum (McIntyre and Brideaux, 1980) Helenes, 1984
Originally Millioudodinium, subsequently (and now) Cribroperidinium?.
At the time of the transfer, Helenes, 1984, considered this to be a provisionally assigned species of Cribroperidinium.
Holotype: McIntyre and Brideaux, 1980, pl.3, figs.2-3,7; Jan du Chêne et al., 1986, pl.24, figs.4-6
Locus typicus: Martin Creek, District of Mackenzie, Canada
Stratum typicum: Valanginian
Original diagnosis: McIntyre and Brideaux, 1980, p. 15: Millioudodinium saetigerum
Phragma: Periphragm - About 1 um thick, punctate, bearing small, scattered intratabular apiculate sculpture elements and densely spaced parasutural apiculae about 0.5-1.0 Ám high. Endophragm - About 1.0 Ám thick, surface presurnably smooth or scabrate.
Paratabulation: Pericyst - Parasutural apiculae denote a paratabulation of 4", 6", 6c, 5"""-?6""", ?1p, 1"""". Endocyst - Paratabulation not observed. Pericingulum - Helicoid, displaced one pericingular width (5-7 Ám), slightly indented; six cingular paraplates denoted by parasutural apiculae. Perisulcus - Present; denoted by a shallow S-shaped depression, narrow anteriorly, broadening posteriorly on the hypopericyst, and widest at the posterior end.
Archeopyle: Precingular, Type P(3"). Operculum free, simple, longer than broad, rounded-polygonal.
Variation: Periphragm of an amorphous consistency, apparently degraded, obscuring details of paratabulation particularly at the apex and antapex.
Dimensions: Pericyst length, 70-87 Ám, width 51-70 Ám.
Affinities:
McIntyre and Brideaux, 1980, p. 15: Millioudodinium saetigerum
Millioudodinium episomum (Sarjeant) Stover and Evitt, 1978 has thin parasutural spinelets connected distally by trabecula; Gonyaulacysta microceras Eisenack, 1958 has low, narrow crests, in places bearing small spines; Apteodinium nuciforme (Deflandre) Stover and Evitt, 1978 is very coarsely granular and thick walled; and Millioudodinium pallum (Sarjeant) Stover and Evitt, 1978 has paratabulatlon denoted by very short spines arising from low ridges.
Originally Millioudodinium, subsequently (and now) Cribroperidinium?.
At the time of the transfer, Helenes, 1984, considered this to be a provisionally assigned species of Cribroperidinium.
Holotype: McIntyre and Brideaux, 1980, pl.3, figs.2-3,7; Jan du Chêne et al., 1986, pl.24, figs.4-6
Locus typicus: Martin Creek, District of Mackenzie, Canada
Stratum typicum: Valanginian
Original diagnosis: McIntyre and Brideaux, 1980, p. 15: Millioudodinium saetigerum
Phragma: Periphragm - About 1 um thick, punctate, bearing small, scattered intratabular apiculate sculpture elements and densely spaced parasutural apiculae about 0.5-1.0 Ám high. Endophragm - About 1.0 Ám thick, surface presurnably smooth or scabrate.
Paratabulation: Pericyst - Parasutural apiculae denote a paratabulation of 4", 6", 6c, 5"""-?6""", ?1p, 1"""". Endocyst - Paratabulation not observed. Pericingulum - Helicoid, displaced one pericingular width (5-7 Ám), slightly indented; six cingular paraplates denoted by parasutural apiculae. Perisulcus - Present; denoted by a shallow S-shaped depression, narrow anteriorly, broadening posteriorly on the hypopericyst, and widest at the posterior end.
Archeopyle: Precingular, Type P(3"). Operculum free, simple, longer than broad, rounded-polygonal.
Variation: Periphragm of an amorphous consistency, apparently degraded, obscuring details of paratabulation particularly at the apex and antapex.
Dimensions: Pericyst length, 70-87 Ám, width 51-70 Ám.
Affinities:
McIntyre and Brideaux, 1980, p. 15: Millioudodinium saetigerum
Millioudodinium episomum (Sarjeant) Stover and Evitt, 1978 has thin parasutural spinelets connected distally by trabecula; Gonyaulacysta microceras Eisenack, 1958 has low, narrow crests, in places bearing small spines; Apteodinium nuciforme (Deflandre) Stover and Evitt, 1978 is very coarsely granular and thick walled; and Millioudodinium pallum (Sarjeant) Stover and Evitt, 1978 has paratabulatlon denoted by very short spines arising from low ridges.